Don't get nervous just because the teacher might ask you a question.别因为老师有可能提问你，就过于紧张。

We can't assume it will rain today just because it rained yesterday.我们不能仅仅因为昨天下雨了，就认为今天也会下雨。

Just because your friends do it, that doesn't mean that you should do it, too.你朋友这样做了并不意味着你也应该这样做。